2 * Copyright (c) 1987, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/usr.bin/last/last.c,v 1.10.6.11 2002/11/02 23:00:26 mux Exp $
34 * $DragonFly: src/usr.bin/last/last.c,v 1.4 2003/11/03 19:31:30 eirikn Exp $
36 * @(#) Copyright (c) 1987, 1993, 1994 The Regents of the University of California. All rights reserved.
37 * @(#)last.c 8.2 (Berkeley) 4/2/94
40 #include <sys/param.h>
55 #include <sys/queue.h>
57 #define NO 0 /* false/no */
58 #define YES 1 /* true/yes */
59 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
61 static struct utmp buf[1024]; /* utmp read buffer */
64 char *name; /* argument */
68 int type; /* type of arg */
69 struct arg *next; /* linked list pointer */
71 ARG *arglist; /* head of linked list */
73 LIST_HEAD(ttylisthead, ttytab) ttylist;
76 time_t logout; /* log out time */
77 char tty[UT_LINESIZE + 1]; /* terminal name */
78 LIST_ENTRY(ttytab) list;
81 static const char *crmsg; /* cause of last reboot */
82 static long currentout, /* current logout value */
83 maxrec; /* records to display */
84 static const char *file = _PATH_WTMP; /* wtmp file */
85 static int sflag = 0; /* show delta in seconds */
86 static int width = 5; /* show seconds in delta */
87 static int yflag; /* show year */
89 static int snapfound = 0; /* found snapshot entry? */
90 static time_t snaptime; /* if != 0, we will only
91 * report users logged in
92 * at this snapshot time
95 int main(int, char *[]);
96 void addarg(int, char *);
97 time_t dateconv(char *);
98 void doentry(struct utmp *);
99 void hostconv(char *);
101 void printentry(struct utmp *, struct ttytab *);
102 char *ttyconv(char *);
103 char *ttyconv(char *);
104 int want(struct utmp *);
111 (void)fprintf(stderr,
112 "usage: last [-#] [-y] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n"
113 "\t[-t tty] [-s|w] [user ...]\n");
118 main(int argc, char **argv)
123 (void) setlocale(LC_TIME, "");
124 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
128 while ((ch = getopt(argc, argv, "0123456789d:f:h:st:wy")) != -1)
130 case '0': case '1': case '2': case '3': case '4':
131 case '5': case '6': case '7': case '8': case '9':
133 * kludge: last was originally designed to take
134 * a number after a dash.
137 p = strchr(argv[optind - 1], ch);
139 p = strchr(argv[optind], ch);
146 snaptime = dateconv(optarg);
153 addarg(HOST_TYPE, optarg);
156 sflag++; /* Show delta as seconds */
159 addarg(TTY_TYPE, ttyconv(optarg));
172 if (sflag && width == 8) usage();
176 for (argv += optind; *argv; ++argv) {
177 #define COMPATIBILITY
179 /* code to allow "last p5" to work */
180 addarg(TTY_TYPE, ttyconv(*argv));
182 addarg(USER_TYPE, *argv);
191 * read through the wtmp file
196 struct utmp *bp; /* current structure */
197 struct stat stb; /* stat of file for size */
205 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
207 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
209 (void)time(&buf[0].ut_time);
210 (void)signal(SIGINT, onintr);
211 (void)signal(SIGQUIT, onintr);
214 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 ||
215 (bytes = read(wfd, buf, sizeof(buf))) == -1)
217 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp)
220 tm = localtime(&buf[0].ut_time);
221 (void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm);
227 * process a single wtmp entry
230 doentry(struct utmp *bp)
232 struct ttytab *tt, *ttx; /* ttylist entry */
235 * if the terminal line is '~', the machine stopped.
236 * see utmp(5) for more info.
238 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
239 /* everybody just logged out */
240 for (tt = LIST_FIRST(&ttylist); tt;) {
241 LIST_REMOVE(tt, list);
243 tt = LIST_NEXT(tt, list);
246 currentout = -bp->ut_time;
247 crmsg = strncmp(bp->ut_name, "shutdown", UT_NAMESIZE) ?
248 "crash" : "shutdown";
250 * if we're in snapshot mode, we want to exit if this
251 * shutdown/reboot appears while we we are tracking the
254 if (snaptime && snapfound)
257 * don't print shutdown/reboot entries unless flagged for
259 if (!snaptime && want(bp))
260 printentry(bp, NULL);
264 * if the line is '{' or '|', date got set; see
265 * utmp(5) for more info.
267 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') &&
269 if (want(bp) && !snaptime)
270 printentry(bp, NULL);
273 /* find associated tty */
274 LIST_FOREACH(tt, &ttylist, list)
275 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
280 tt = malloc(sizeof(struct ttytab));
282 err(1, "malloc failure");
283 tt->logout = currentout;
284 strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
285 LIST_INSERT_HEAD(&ttylist, tt, list);
289 * print record if not in snapshot mode and wanted
290 * or in snapshot mode and in snapshot range
292 if (bp->ut_name[0] && (want(bp) || (bp->ut_time < snaptime &&
293 (tt->logout > snaptime || tt->logout < 1)))) {
296 * when uucp and ftp log in over a network, the entry in
297 * the utmp file is the name plus their process id. See
298 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
300 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
301 bp->ut_line[3] = '\0';
302 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
303 bp->ut_line[4] = '\0';
306 tt->logout = bp->ut_time;
313 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or
314 * logout type (crash/shutdown) as appropriate.
317 printentry(struct utmp *bp, struct ttytab *tt)
321 time_t delta; /* time difference */
323 if (maxrec != -1 && !maxrec--)
325 tm = localtime(&bp->ut_time);
326 (void) strftime(ct, sizeof(ct), d_first ?
327 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") :
328 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm);
329 printf("%-*.*s %-*.*s %-*.*s %s%c",
330 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
331 UT_LINESIZE, UT_LINESIZE, bp->ut_line,
332 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
333 ct, tt == NULL ? '\n' : ' ');
337 puts(" still logged in");
340 if (tt->logout < 0) {
341 tt->logout = -tt->logout;
342 printf("- %s", crmsg);
344 tm = localtime(&tt->logout);
345 (void) strftime(ct, sizeof(ct), "%R", tm);
348 delta = tt->logout - bp->ut_time;
350 printf(" (%8ld)\n", (long)delta);
353 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
355 printf(" (%s)\n", ct);
357 printf(" (%ld+%s)\n", (long)delta / 86400, ct);
363 * see if want this entry
366 want(struct utmp *bp)
376 for (step = arglist; step; step = step->next)
379 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
383 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
387 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
396 * add an entry to a linked list of arguments
399 addarg(int type, char *arg)
403 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
404 err(1, "malloc failure");
413 * convert the hostname to search pattern; if the supplied host name
414 * has a domain attached that is the same as the current domain, rip
415 * off the domain suffix since that's what login(1) does.
420 static int first = 1;
421 static char *hostdot, name[MAXHOSTNAMELEN];
424 if (!(argdot = strchr(arg, '.')))
428 if (gethostname(name, sizeof(name)))
429 err(1, "gethostname");
430 hostdot = strchr(name, '.');
432 if (hostdot && !strcasecmp(hostdot, argdot))
438 * convert tty to correct name.
446 * kludge -- we assume that all tty's end with
447 * a two character suffix.
449 if (strlen(arg) == 2) {
450 /* either 6 for "ttyxx" or 8 for "console" */
451 if (!(mval = malloc((u_int)8)))
452 err(1, "malloc failure");
453 if (!strcmp(arg, "co"))
454 (void)strcpy(mval, "console");
456 (void)strcpy(mval, "tty");
457 (void)strcpy(mval + 3, arg);
461 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
468 * Convert the snapshot time in command line given in the format
469 * [[CC]YY]MMDDhhmm[.SS]] to a time_t.
470 * Derived from atime_arg1() in usr.bin/touch/touch.c
480 /* Start with the current time. */
481 if (time(&timet) < 0)
483 if ((t = localtime(&timet)) == NULL)
486 /* [[CC]YY]MMDDhhmm[.SS] */
487 if ((p = strchr(arg, '.')) == NULL)
488 t->tm_sec = 0; /* Seconds defaults to 0. */
490 if (strlen(p + 1) != 2)
493 t->tm_sec = ATOI2(p);
497 switch (strlen(arg)) {
498 case 12: /* CCYYMMDDhhmm */
499 t->tm_year = ATOI2(arg);
503 case 10: /* YYMMDDhhmm */
505 yearset = ATOI2(arg);
506 t->tm_year += yearset;
508 yearset = ATOI2(arg);
510 t->tm_year = yearset + 2000;
512 t->tm_year = yearset + 1900;
514 t->tm_year -= 1900; /* Convert to UNIX time. */
516 case 8: /* MMDDhhmm */
517 t->tm_mon = ATOI2(arg);
518 --t->tm_mon; /* Convert from 01-12 to 00-11 */
519 t->tm_mday = ATOI2(arg);
520 t->tm_hour = ATOI2(arg);
521 t->tm_min = ATOI2(arg);
524 t->tm_hour = ATOI2(arg);
525 t->tm_min = ATOI2(arg);
530 t->tm_isdst = -1; /* Figure out DST. */
534 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
541 * on interrupt, we inform the user how far we've gotten
549 tm = localtime(&buf[0].ut_time);
550 (void) strftime(ct, sizeof(ct),
551 d_first ? "%a %e %b %R" : "%a %b %e %R",
553 printf("\ninterrupted %s\n", ct);
556 (void)fflush(stdout); /* fix required for rsh */